EP4426953B1 - Procédé de surveillance d'un système hydraulique - Google Patents

Procédé de surveillance d'un système hydraulique

Info

Publication number
EP4426953B1
EP4426953B1 EP22809416.5A EP22809416A EP4426953B1 EP 4426953 B1 EP4426953 B1 EP 4426953B1 EP 22809416 A EP22809416 A EP 22809416A EP 4426953 B1 EP4426953 B1 EP 4426953B1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
pump
leakage
consumer
subsystem
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP22809416.5A
Other languages
German (de)
English (en)
Other versions
EP4426953A1 (fr
EP4426953C0 (fr
Inventor
Stefan Moser
Sina Greger-Gürbüz
Sebastian Fruth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KraussMaffei Technologies GmbH
Original Assignee
KraussMaffei Technologies GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by KraussMaffei Technologies GmbH filed Critical KraussMaffei Technologies GmbH
Publication of EP4426953A1 publication Critical patent/EP4426953A1/fr
Application granted granted Critical
Publication of EP4426953B1 publication Critical patent/EP4426953B1/fr
Publication of EP4426953C0 publication Critical patent/EP4426953C0/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/82—Hydraulic or pneumatic circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08—Regulating by delivery pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/10—Other safety measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B51/00—Testing machines, pumps, or pumping installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • F15B19/005—Fault detection or monitoring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/82—Hydraulic or pneumatic circuits
    • B29C2045/826—Plurality of hydraulic actuators driven by one hydraulic pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2201/00—Pump parameters
    • F04B2201/08—Cylinder or housing parameters
    • F04B2201/0803—Leakage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/09—Flow through the pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20507—Type of prime mover
    • F15B2211/20515—Electric motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6309—Electronic controllers using input signals representing a pressure the pressure being a pressure source supply pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/633—Electronic controllers using input signals representing a state of the prime mover, e.g. torque or rotational speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6333—Electronic controllers using input signals representing a state of the pressure source, e.g. swash plate angle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6336—Electronic controllers using input signals representing a state of the output member, e.g. position, speed or acceleration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7058—Rotary output members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7135—Combinations of output members of different types, e.g. single-acting cylinders with rotary motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/863—Control during or prevention of abnormal conditions the abnormal condition being a hydraulic or pneumatic failure
    • F15B2211/8633—Pressure source supply failure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/863—Control during or prevention of abnormal conditions the abnormal condition being a hydraulic or pneumatic failure
    • F15B2211/864—Failure of an output member, e.g. actuator or motor failure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/865—Prevention of failures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/87—Detection of failures

Definitions

  • the document DE 10 2019 117 820 A1 discloses a method for monitoring the condition of a hydraulic pump in a hydraulic system of a molding machine, in particular an injection molding machine.
  • the hydraulic pump is connected to a pressure line and is operated at a displacement volume or a rotational speed to provide pressure in the pressure line.
  • the displacement volume or rotational speed of the hydraulic pump is suddenly changed.
  • a condition of the hydraulic pump is determined by analyzing a temporal response of the pressure in the hydraulic pump and/or in the pressure line.
  • JP 2020 076223 discloses another known method for monitoring a hydraulic system consisting of several hydraulic components.
  • a hydraulic system consists of several hydraulic components and generally comprises a tank as a source of hydraulic fluid, at least one hydraulic pump driven by a motor, and one or more hydraulic consumers through which the hydraulic fluid delivered by the hydraulic pump flows. Valves are usually also present as additional hydraulic components.
  • the aforementioned hydraulic components are interconnected by means of lines to form a hydraulic system. To monitor the condition of such a hydraulic system, it is necessary to determine the condition of each individual hydraulic component, but at least of the hydraulic pump.
  • the at least one hydraulic pump within a hydraulic system is measured, since its leakage affects all subsequent hydraulic components.
  • the inventive The method provides the following step (a): Determination of the leakage of the at least one hydraulic pump as a function of the pressure in the hydraulic pump using predeterminable values of the pressure in the hydraulic pump.
  • step (d1) the efficiency of the hydraulic pump in the subsystems is determined in the current operating state, i.e., at the pressure prevailing at the hydraulic pump during current operation.
  • the operating state can be understood as the combination of a consumer movement at an effective volume flow and the pressure prevailing at the hydraulic pump in the current state.
  • the currently prevailing pressure at the hydraulic pump results from the force that the consumer must apply to generate the movement.
  • “Current” means the time at which step (d1) is executed or the short period of time in which step (d1) is executed. For this purpose, the volume flow actually delivered by the pump, calculated from the leakage from step (a) of this hydraulic pump, is compared to the volume flow requested by the consumer in the subsystem.
  • the volume flow actually delivered by the pump to this consumer in the operating state is determined by taking into account the pump leakage from step (a).
  • step (a) can be performed repeatedly at predeterminable times TA, preferably once per day, particularly preferably once per hour.
  • TA preferably once per day, particularly preferably once per hour.
  • step (b) can be repeated in predeterminable time steps ⁇ T, wherein ⁇ T is preferably less than 10 minutes, in particular less than 1 minute.
  • a first subsystem with a hydraulic cylinder and a second subsystem with a hydraulic motor can be provided, wherein the two subsystems can be operated sequentially.
  • standstill phases can be provided in which the hydraulic system is not operated and the consumers of the hydraulic system are not actuated, wherein step (a) is carried out in one or more such standstill phases.
  • a hydraulic system contains several valves with different functions. These can be purely shut-off valves or purely switching valves. Other valves, such as proportional valves, can also be present. Thus, one or more valves can also be present in one or more of the subsystems. According to one embodiment of the invention, the contribution of these valves can be disregarded or neglected when determining the leakage of the consumer of a subsystem.
  • the efficiency of one or more, preferably all, of the checked subsystems in the hydraulic system can be determined by relating the actual effective volume flow of a subsystem to the requested volume flow in this subsystem.
  • the consumer(s) can perform a translational or a rotational movement, or a consumer can be designed in such a way that a translational or a rotational movement can be performed.
  • calculations are based solely on existing consumer data and measured actual values of the consumers in their operating state.
  • the available data can be obtained from the relevant consumer data sheets. This can include, among other things, the following data: displacement of the hydraulic motor, area ratio of the hydraulic cylinder, displacement of the pump.
  • the actual values are measured using suitable sensors. These can include, among other things, the following variables: pump speed, pump swivel angle, hydraulic motor speed, and axial speed of the hydraulic cylinder.
  • Pulp leakage the volume per unit of time that the pump draws from the tank but does not transfer to a downstream consumer. It is the difference between the drawn-in and discharged flow rates.
  • Volume flow volume pumped per unit of time, for example in liters per minute.
  • the Figure 1 shows a block diagram of a hydraulic system with a hydraulic pump 1 – sometimes referred to simply as "pump” below – and two hydraulic consumers, namely a hydraulic cylinder 2 and a hydraulic motor 3.
  • the hydraulic system is supplied with a hydraulic fluid, in particular hydraulic oil, from a tank 4.
  • the hydraulic system further comprises a shut-off valve 5, a proportional valve 6, and a switching valve 7.
  • a motor 8 serves to drive the hydraulic pump 1.
  • a first subsystem is formed by the hydraulic pump 1, shut-off valve 5, switching valve 7, and hydraulic cylinder 2.
  • a second subsystem is formed by the hydraulic pump 1, shut-off valve 5, proportional valve 6, and hydraulic motor 3. Neglecting leaks at the valves 5, 6, and 7, the following subsystems can also be considered: a first subsystem consisting of the hydraulic pump 1 and hydraulic cylinder 2, and a second subsystem consisting of the hydraulic pump 1 and hydraulic motor 3.
  • Step (a) Determine the leakage of the hydraulic pump
  • a first step (a) the leakage of the hydraulic pump in its current state is measured via pressure.
  • hydraulic pump 1 is decoupled from the downstream hydraulic components using the shut-off valve 5.
  • the starting point for determining leakage is the pump control concept.
  • the pump can be specified how much oil it should deliver, i.e. a target volume flow can be specified. Because the shut-off valve 5 is closed, the specified oil delivery rate or the target volume flow can only flow out of the hydraulic pump 1 as leakage oil. This creates a certain pressure in the hydraulic pump 1. The more target volume is requested when the valve 5 is closed, the higher the pressure that is created.
  • the leakage oil flows back into the tank 4 via a leakage oil line and is therefore not available on the output side of the pump 1.
  • the delivered volume flow of oil therefore corresponds to the volume flow of leakage oil. It is therefore possible to determine at which pressure p which volume flow of leakage oil is present.
  • the target volume flow is continuously increased, preferably in ramp form. Predefined levels can also be approached.
  • the resulting pressure values and the oil temperature values are continuously detected and recorded.
  • the process is preferably carried out over the entire pressure range that can be generated by the pump. If the target flow rate is increased in many small steps, and thus also the resulting pressure, a nearly continuous flow of leakage oil occurs across the pump's pressure range. This process is preferably continued until the pressure limit p max of the hydraulic pump or the upper limit of the hydraulic pump's operating range is reached.
  • the Figure 2 shows the result of such a measurement of a hydraulic pump, namely the percentage leakage at the respective pressure-dependent operating point of the hydraulic pump.
  • the leakage of the pump as the supplier for all downstream components, is known and provided as a reference. Due to wear mechanisms during its service life, the leakage of the pump increases over time.
  • the previously described measurement is carried out at preferably defined intervals for each hydraulic pump in the system in order to document a trend over time in a suitable database system and to derive a forecast of the wear progression over future use. Since only target values and measured values that already exist in common hydraulic systems are used, no additional sensors are necessary.
  • step (a) of the method according to the invention only applies to the time being examined. Therefore, step (a) is repeated from time to time, in particular at regular intervals. For example, step (a) can be performed once a day, in particular always at the same time.
  • V is measured at the cylinder as the consumer and N is at the hydraulic motor as the consumer.
  • Step (b) Determination of subsystem leakage
  • the current leakage of the subsystems that can be isolated from each other is determined.
  • a first subsystem consisting of hydraulic pump 1 and hydraulic cylinder 2 as well as a second subsystem consisting of hydraulic pump 1 and hydraulic motor 3, can be considered.
  • the subsystems are isolated from each other, each subsystem is operated independently, and the leakage is determined in the operating state.
  • a speed N actual is set, which results from the actually effective volume flow Q motor .
  • the actually effective volume flow Q motor at the hydraulic motor 3 is calculated from the desired volume flow of the hydraulic motor 3 according to equation (2) above, minus the leaks at the pump 1 and the hydraulic motor 3 as follows:
  • Q Motor Q soll ⁇ Q leck Pumpe ⁇ Q leck Motor
  • step (b1) the leakage of the subsystem consisting of pump 1 and hydraulic motor 3 is known for the operating state of a certain desired target speed N soll .
  • the total leakage of the subsystem is the target volume flow Q target and the effective volume flow Q cylinder from equation (16) as follows:
  • Q leck Bac Q soll ⁇ v ist ⁇
  • Step (d) Determination of the efficiency of the hydraulic system
  • the efficiency can be calculated from the flow rates.
  • Q Motor at the hydraulic motor

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Fluid-Pressure Circuits (AREA)

Claims (11)

  1. Procédé de surveillance d'un système hydraulique composé de plusieurs composantes hydrauliques, comprenant une source d'un fluide hydraulique, au moins une pompe hydraulique ou plusieurs consommateurs hydrauliques, lesquels sont traversés par le fluide hydraulique transporté par la pompe hydraulique, dans lequel le procédé comprend les étapes suivantes :
    (a) détermination de la fuite de l'au moins une pompe hydraulique en fonction de la pression dans la pompe hydraulique par des valeurs pouvant être prédéfinies de la pression dans la pompe hydraulique ;
    (b) fonctionnement d'un ou plusieurs sous-systèmes hydrauliques du système hydraulique, de préférence tous, pouvant être coupés entre eux et détermination de la fuite actuelle de ces sous-systèmes dans l'état de fonctionnement, dans lequel un sous-système est formé par l'au moins une pompe hydraulique de l'étape (a) et un consommateur,
    (c) détermination de la fuite des consommateurs des sous-systèmes entraînés selon l'étape (b) par formation de la valeur différentielle entre la fuite de l'au moins une pompe hydraulique de l'étape (a) et la fuite de ce même sous-système de l'étape (b) qui présente ledit consommateur,
    (d) détermination du rendement des composantes du système hydraulique selon les étapes de :
    (d1) détermination du rendement de la pompe dans les sous-systèmes dans l'état de fonctionnement en ce que le débit volumique QistPumpe calculé à partir de la fuite (a) à l'état de fonctionnement et effectivement transporté par la pompe est mis en rapport avec le débit volumique Qsoll requis par le consommateur dans le sous-système,
    (d2) détermination du rendement du ou des consommateur(s) dans l'état de fonctionnement, en ce que le débit volumique QVerbrauche effectivement efficace pour la transmission de force à un consommateur défini dans l'état de fonctionnement est mis en rapport avec le débit volumique Qist transporté effectivement par la pompe dans l'état de fonctionnement et fourni à ce consommateur, dans lequel le débit volumique efficace au consommateur dans l'état de fonctionnement est déterminé par les fuites des étapes (a) et (c) et le débit volumique fourni effectivement à ce consommateur par la pompe dans l'état de fonctionnement est déterminé en tenant compte de la fuite de la pompe de l'étape (a).
  2. Procédé selon la revendication 1, caractérisé en ce que l'étape (a) est exécutée de manière répétée à des temps pouvant être prédéfinis TA, de préférence 1x par jour, particulièrement de préférence 1x par heure.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'étape (b) est répétée à des temps pouvant être prédéfinis TB, dans lequel dans un système hydraulique d'une machine fonctionnant par cycles, en particulier d'une machine de moulage par injection, d'une presse ou d'une machine-outil, l'étape (b) est exécutée dans chaque nème cycle, dans lequel n est de préférence inférieur à 10 et particulièrement de préférence n=1.
  4. Procédé selon la revendication 1 ou 2, caractérisé en ce que dans un système hydraulique d'une machine fonctionnant en continu, en particulier d'une extrudeuse, l'étape (b) est répétée à des intervalles ΔT pouvant être prédéfinis, dans lequel ΔT est de préférence inférieur à 10 minutes, en particulier inférieur à une 1 minute.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'un premier sous-système avec un vérin hydraulique et un second sous-système avec un moteur hydraulique sont prévus, et que les deux sous-systèmes sont entraînés de manière séquentielle.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que des phases d'arrêt sont prévues, dans lesquelles le système hydraulique n'est pas entraîné et les consommateurs du système hydraulique ne sont pas actionnés, et que l'étape (a) est exécutée dans une ou plusieurs des phases d'arrêt.
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'un ou plusieurs clapets sont présents dans un ou plusieurs des sous-systèmes et que la part de ces clapets n'est pas prise en compte, respectivement est négligée dans la détermination de la fuite du consommateur d'un sous-système.
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'une détermination du rendement d'un ou plusieurs, de préférence tous, des sous-systèmes contrôlés dans le système hydraulique est effectuée, en ce que le débit volumique réellement efficace d'un sous-système QVerbraucher est mis en rapport avec le débit volumique requis Qsoll dans ce sous-système.
  9. Procédé selon la revendication 8, caractérisé en ce qu'un calcul du rendement moyen de la totalité du système hydraulique est effectué, en ce que les rendements des sous-systèmes sont pondérés avec les durées proportionnelles des différentes phases du procédé, à savoir selon η Gesamt = η 1 ⋅ t 1 + η 2 ⋅ t 2 + ⋯ + η n ⋅ t n t Gesamt dans lequel η est le rendement d'un sous-système et t la durée pendant laquelle le sous-système est entraîné.
  10. Procédé selon la revendication 9, caractérisé en ce qu'il s'agit d'un système hydraulique d'une machine fonctionnant par cycles, en particulier d'une machine de moulage par injection et que la somme des différentes phases de procédé correspond à un cycle.
  11. Procédé selon l'une des revendications précédentes, caractérisé en ce que le(s) consommateur(s) exécute(nt) un mouvement de translation ou de rotation, respectivement sont conçus de façon à ce qu'un mouvement de translation ou de rotation puisse être effectué.
EP22809416.5A 2021-11-03 2022-10-26 Procédé de surveillance d'un système hydraulique Active EP4426953B1 (fr)

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DE102023210643A1 (de) * 2023-10-27 2025-04-30 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zum Betrieb einer Druckmittelversorgungseinrichtung eines elektrohydraulischen Systems
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